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| Subsidiaries of Tetra Tech, Inc. | ||||||||
| NAME | JURISDICTION OF FORMATION | |||||||
| Advanced Management Technology, Inc. | Virginia | |||||||
| American Environmental Group, Ltd. | Ohio | |||||||
| Amyx, Inc. | Delaware | |||||||
| ARD, Inc. | Vermont | |||||||
| Ardaman & Associates, Inc. | Florida | |||||||
| BlueWater Federal Solutions, Inc. | Delaware | |||||||
| Cosentini Associates, Inc. | New York | |||||||
| Global Tech Inc. | Virginia | |||||||
| Glumac | California | |||||||
| Hoare Lea LLP | United Kingdom | |||||||
| INDUS Corporation | Virginia | |||||||
| Management Systems International, Inc. | District of Columbia | |||||||
| PRO-telligent, LLC | Delaware | |||||||
| Rooney Engineering, Inc. | Colorado | |||||||
| RPS AAP Consulting Pty Ltd | Australia | |||||||
| R P S Group Limited | United Kingdom | |||||||
| Segue Technologies, Inc. | Virginia | |||||||
| Tetra Tech Australia Pty Ltd | Australia | |||||||
| Tetra Tech BAS, Inc. | California | |||||||
| Tetra Tech Canada Holding Corporation | Canada | |||||||
| Tetra Tech Canada, Inc. | Canada | |||||||
| Tetra Tech Coffey Pty Ltd | Australia | |||||||
| Tetra Tech Construction, Inc. | New York | |||||||
| Tetra Tech EC, Inc. | Delaware | |||||||
| Tetra Tech EMC, Inc. | California | |||||||
| Tetra Tech ES, Inc. | Delaware | |||||||
| Tetra Tech Executive Services, Inc. | California | |||||||
| Tetra Tech Holding LLC | Delaware | |||||||
| Tetra Tech Holdings Pty Ltd. | Australia | |||||||
| Tetra Tech International Development Pty Ltd | Australia | |||||||
| Tetra Tech Limited | United Kingdom | |||||||
| Tetra Tech RPS Energy Pty Ltd | Australia | |||||||
| Tetra Tech Tesoro, Inc. | Virginia | |||||||
| Tetra Tech UK Holdings Limited | United Kingdom | |||||||
| The Kaizen Company, LLC | District of Columbia | |||||||